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1989 Buick Lesabre stalling at idle

Tiny
RWRIGHT17
  • MEMBER
  • 1989 BUICK LESABRE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 92,000 MILES
When I start the car it will not idel unless I have my foot on the gas pedel, I have noticied that the colling fan is on when I start, one the fan goes off the car will smooth out and idle at normal speed, but when the fan comes back on it pulls the engine down and almost stalls out. What could be causing this?

thank you
Roger
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Monday, March 9th, 2009 AT 11:59 AM

5 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hello, are there any codes? Your obd1, you should be able to check the codes, yourself. As far as the fan on some models, if the CTS is unplugged, the fan comes on, if the ac controls are on, the fan my run. I can't tell, It might be an issue with the cts.

As far as idle, I'd look at the idle air control system.
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Monday, March 9th, 2009 AT 12:14 PM
Tiny
RWRIGHT17
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  • 3 POSTS
There are no codes comming up, also need to know what CTS stands for?

Thank you
Roger
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Monday, March 9th, 2009 AT 1:39 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Does the CEL even come on? I believe there should have been a code 12, if nothing else.

Cts is coolant temp sensor, if the cel isn't coming on, I wouldn't worry about that sensor, I can't be sure it is faulty.
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Monday, March 9th, 2009 AT 2:39 PM
Tiny
RWRIGHT17
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Code 12 does show 3 Times like it should
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Monday, March 9th, 2009 AT 5:29 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
If it runs good off idle, but, no idle, check the idle air system.
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Tuesday, March 10th, 2009 AT 8:54 AM

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